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Heart problems in people with heart conditions People with allergies or heart issues should tell their doctor before getting B12 shots
If you have unexplained fatigue, brain fog, low B12, or digestive symptoms that no one has been able to explain, it is genuinely the time to look deeper
[PMC free article] [PubMed] [Reference list]
Cyano-B12 is the most commonly used, and cheapest, form of B12 with no substantial evidence that other forms are more effective in improving B12 status
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